Cumulated Ylides XIX.1 Chain-lengthening Difunctionalization of Grignard Compounds by Reaction with Ketenylidenetriphenylphosphorane. A New Route to (E)-α,β- Unsatured Ketones and the Queen Substance2 The reaction of Grignard compounds with ketenylidenetriphenylphosphorane and subsequent hydrolysis yields 2-oxoalkylidenetriphenylphosphoranes. The latter undergo Wittig reaction, whereby (E-α,β-unsaturated ketones are obtained. An application of this strategy to the synthesis of carbonyl homologues of Lepidoptera pheromones and the queen substance is shown.
累积叶立德 XIX.1 通过与
酮烯亚基
三苯基膦的反应延长Grignard化合物的链并赋予双功能化。 (E)-α,β-不饱和
酮的新路径和女王物质2 Grignard化合物与
酮烯亚基
三苯基膦反应并随后
水解生成2-
氧代烷亚基
三苯基膦。后者进行Wittig反应,从中获得(E)-α,β-不饱和
酮。这种策略应用于合成鳞翅目昆虫信息素的羰基同系物和女王物质的一个例子。